This book is associated with an event called Comiket Special 5 (styled as コみケッとスペシャル5 here), which was held in the city of Mito (水戸).

The book is described here in Japanese: https://blog.goo.ne.jp/mitoumeko/e/a7889b1db7acd755bcc398002b99c746
According to this article, the book is a general travel guide for Mito, including the city's history, sightseeing spots, restaurants, hotels, and popular souvenirs. Parts of it are explained using manga.